When it is rotating,the air among the vanes flows along the edge of the vanges under the function of centrifugal force and enters into the annular caviity of the pump.

• 向叶轮的边缘运动，进入泵体的环形空腔，然后又返回叶轮，重新从叶片的起点以同样的方式再进行循环。